How To Fix WL404 - Workflow '&': Workflow def. not activated/cannot be executed at present

SAP Error Message - Details

• Message type: E = Error

• Message class: WL - Workflow: run-time messages

• Message number: 404

• Message text: Workflow '&': Workflow def. not activated/cannot be executed at present

What causes this issue?

The workflow &V1& was to be started. However, the required version of
the relevant workflow definition has not been activated or cannot
currently be started since it is locked for execution:
Workflow task no. &V2&
Workflow definition no. &V3&, version &V4&.

System Response

The workflow could not be started.

How to fix this error?

Check and correct, if necessary, the entries specified above. Activate
the workflow definition mentioned above, if necessary. If the workflow
definition cannot currently be started, contact the workflow system
administrator.
Then re-start the workflow.

Error message extract from SAP system. Copyright SAP SE.